I need a guide to Vengeful Spirit.

I got VS at all hero challange.And i played her, and i lost 3 games in a row with her.I need you guys to help me know when should i pick venge, what item biuld, skill biuld, etc, cuz im not familiar with the hero.Thanks a lot.

You're a sacrifical lamb, do everything you need to save your carry/mid. If you die but save your ally, you did well. Item build is stuff like tranquil boots with urn and force staff (you won't get much more farm if even that). If your team has lots of physical dmg go for 1-4-1 build. Otherwise go for 4-1-1 except if you got some really good push strat in which maxing aura is good. 1-4-1 is also good for early roshan.
Try to pair up with another good roaming support, venge is very very good at ganking mid early.
Buy all the wards/courier/smokes, you are the hard 5, you don't need anything. (only hero that needs less items IMO is shadow demon).

Some quick tips hope this helps a bit at least.

Do you want to play venge as carry or support.

Seriously, Venge carry is also viable as i have seen VP. Illidan play it alot in pro matches as a position one